| Deadliest U.S. Wars | 0 | - | 4.89 | 191,666 |
| US States Quiz | 0 | - | 5.00 | 16,978,405 |
| States of the U.S. in Alphabetical Order | 0 | - | 4.98 | 368,460 |
| Name the U.S. National Parks | 0 | - | 4.86 | 60,412 |
| Total United States Immigration by Country | 0 | - | 4.91 | 112,274 |
| Most Common U.S. Last Names - Extreme | 0 | - | 4.94 | 175,421 |
| "Do Not Travel" Countries for U.S. Citizens | 0 | - | 4.97 | 246,108 |
| U.S. Cabinet Departments | 0 | - | 4.86 | 73,067 |
| Top 10 Non-English Languages Spoken in New York City | 0 | - | 4.85 | 66,664 |
| All 3,143 Counties of the United States on a Map | 0 | - | 4.97 | 334,986 |
| Pixelated United States Map | 0 | - | 4.88 | 94,740 |
| Most-Visited Countries by Americans | 0 | - | 4.86 | 110,420 |
| Countries that Visit the United States the Most | 0 | - | 4.96 | 92,356 |
| The 13 Colonies Quiz | 0 | - | 4.97 | 118,949 |
| U.S. States with the Letter Y | 0 | - | 4.86 | 112,170 |
| 10 Southernmost U.S. States | 0 | - | 4.89 | 114,188 |
| U.S. States with Short Names | 0 | - | 4.91 | 150,231 |
| U.S. States that Start with M | 0 | - | 4.93 | 188,233 |
| U.S. States By Population | 0 | - | 4.92 | 154,071 |
| U.S. States that Start with N | 0 | - | 4.95 | 172,126 |
| U.S. States with Longest Names | 0 | - | 4.85 | 44,830 |
| U.S. States with a Unique First Letter | 0 | - | 4.96 | 88,798 |
| 10 Westernmost U.S. States | 0 | - | 4.95 | 64,502 |
| The Only Remaining U.S. State . . . | 0 | - | 4.93 | 66,029 |
| US States with an Empty Map | 0 | - | 5.00 | 628,054 |
| 10 Longest Rivers in the United States | 0 | - | 4.85 | 39,358 |
| Countries Closest to United States by Continent | 0 | - | 4.99 | 147,087 |
| Countries that Beat the United States | 0 | - | 4.93 | 168,503 |
| Louisiana Purchase with a Map | 0 | - | 4.96 | 49,194 |
| Top 10 Most-Visited U.S. States | 0 | - | 4.90 | 102,375 |
| U.S. States with the Most Immigrants | 0 | - | 4.85 | 82,972 |
| U.S. States or European Countries by Area | 0 | - | 4.95 | 96,925 |
| U.S. States or European Countries by Population | 0 | - | 4.97 | 134,050 |
| Famous People from California by Picture | 0 | - | 4.32 | 36,680 |
| Top 10 Non-English Languages of Los Angeles | 0 | - | 4.43 | 60,088 |
| 10 Closest Megacities to New York City | 0 | - | 4.52 | 67,520 |
| Name a Valid U.S. State #1 | 0 | - | 4.93 | 210,374 |
| Top 10 Coldest U.S. States | 0 | - | 4.94 | 125,769 |
| Top 10 Hottest U.S. States | 0 | - | 4.86 | 126,385 |
| Top 10 Most Native American U.S. States | 0 | - | 4.87 | 92,739 |
| Top 10 U.S. States with the Least Precipitation | 0 | - | 4.83 | 62,174 |
| States of Mexico | 0 | - | 4.96 | 177,959 |
| Mexico States Map Quiz | 0 | - | 4.84 | 105,523 |
| Geography of California | 0 | - | 4.26 | 10,616 |
| Musical Acts from Los Angeles by Two Songs | 0 | - | 4.27 | 16,278 |
| Events in U.S. History | 0 | - | 4.41 | 28,799 |
| U.S. History for Dummies | 0 | - | 4.47 | 83,367 |
| Midwestern States of the U.S. | 0 | - | 4.88 | 14,109 |
| Mexico Cities Map Quiz | 0 | - | 4.83 | 38,788 |
| U.S. State Nicknames | 0 | - | 4.47 | 50,707 |
| Countries with American Expatriates | 0 | - | 4.53 | 42,661 |
| United States Landmarks Map Quiz | 0 | - | 4.55 | 40,266 |
| United States Country Quiz | 0 | - | 4.43 | 102,111 |
| Busiest Air Routes from the U.S. | 0 | - | 4.46 | 77,039 |
| U.S. Presidents Quiz | 0 | - | 5.00 | 3,722,221 |
| American Founding Fathers | 0 | - | 4.42 | 23,270 |
| California Groups of Things | 0 | - | 4.26 | 45,740 |
| Los Angeles vs. New York | 0 | - | 4.41 | 20,008 |
| Hawaiian Islands Map Quiz | 0 | - | 4.78 | 22,313 |
| New York Groups of Things | 0 | - | 4.39 | 71,885 |
| People on Money - United States | 0 | - | 4.31 | 63,423 |
| U.S. History Groups of Two | 0 | - | 4.23 | 44,574 |
| 100 Most Influential Figures in U.S. History | 0 | - | 4.20 | 45,194 |
| Most-Visited Countries by Canadians | 0 | - | 4.83 | 39,583 |
| Countries Closest to Canada | 0 | - | 4.91 | 199,007 |
| Asian Countries Americans Travel to the Most | 0 | - | 4.75 | 60,177 |
| Names of Generations | 0 | - | 4.09 | 45,457 |
| Movies Set in San Francisco | 0 | - | 4.23 | 19,957 |
| Who Did that Motown Song? | 0 | - | 4.48 | 13,072 |
| Countries that Beat Canada | 0 | - | 4.91 | 98,922 |
| U.S. Geography by Letter - B | 0 | - | 4.53 | 69,863 |
| U.S. Geography by Letter - S | 0 | - | 4.55 | 53,287 |
| United States Map Quiz | 0 | - | 4.98 | 4,169,559 |
| Two Letter U.S. State Abbreviations | 0 | - | 4.19 | 749,338 |
| Countries Closest to the U. S. | 0 | - | 4.41 | 210,370 |
| American Geography Quiz for Dummies | 0 | - | 4.41 | 69,385 |
| U.S. Federal Agency Acronyms | 0 | - | 4.50 | 80,119 |
| Countries Closest to Alaska | 0 | - | 4.93 | 125,020 |
| Countries Closest to Maine | 0 | - | 4.85 | 67,531 |
| New York Pro Sport Teams | 0 | - | 4.32 | 25,954 |
| Six Flags Over Texas | 0 | - | 4.78 | 63,577 |
| History of Pennsylvania | 0 | - | 4.16 | 7,162 |
| History of Virginia | 0 | - | 4.33 | 11,640 |
| New England States | 0 | - | 4.51 | 59,887 |
| U.S. License Plates Picture Quiz | 0 | - | 4.61 | 53,110 |
| U.S. States with the Fewest Immigrants | 0 | - | 4.64 | 66,049 |
| U.S. States by Land Area | 0 | - | 4.55 | 53,025 |
| Top 10 U.S. States by Inland Water Area | 0 | - | 4.53 | 38,106 |
| U.S. States with the Highest Percentage of Farmland | 0 | - | 4.80 | 65,606 |
| U.S. States with the Lowest Percentage of Farmland | 0 | - | 4.74 | 55,318 |
| Add a Letter - Make a U.S. State | 0 | - | 4.70 | 83,092 |
| Top 10 Widest U.S. States East to West | 0 | - | 4.70 | 56,256 |
| Top 10 Tallest U.S. States North to South | 0 | - | 4.75 | 41,117 |
| U.S. States by Borders | 0 | - | 4.62 | 35,455 |
| Walking Across U.S. State Borders with Hints | 0 | - | 4.74 | 35,115 |
| Save Americans by Guessing U.S. States | 0 | - | 4.61 | 188,437 |
| 10 Easternmost U.S. States | 0 | - | 4.53 | 56,667 |
| The Only U.S. State ... #1 | 0 | - | 4.52 | 102,305 |
| U.S. States with the Longest International Borders | 0 | - | 4.78 | 45,919 |
| Longest U.S. State Borders | 0 | - | 4.69 | 40,086 |
| 50 States, 50 Cities - Hard Version | 0 | - | 4.46 | 44,425 |
| Top 10 U.S. States with the Highest Elevation | 0 | - | 4.51 | 67,970 |
| U.S. States with the Lowest Average Elevation | 0 | - | 4.55 | 38,564 |
| U.S. States With the Highest Average Elevation | 0 | - | 4.61 | 32,832 |
| U.S. States with the Fewest Borders | 0 | - | 4.78 | 114,174 |
| U.S. States with the Most Borders | 0 | - | 4.53 | 62,358 |
| Asian Last Names in the United States | 0 | - | 4.43 | 46,944 |
| Flags of North and South America | 0 | - | 4.99 | 376,374 |
| Belize Country Quiz | 0 | - | 4.85 | 21,073 |
| Saint Vincent and the Grenadines Country Quiz | 0 | - | 4.88 | 19,294 |
| Top U.S. Universities | 0 | - | 4.15 | 145,722 |
| Largest United States Airlines | 0 | - | 4.39 | 55,138 |
| U.S. Five-Star Generals and Admirals | 0 | - | 4.33 | 8,357 |
| 10 U.S. States With The Lowest Murder Rates | 0 | - | 4.48 | 52,916 |
| Biggest Trading Partners - United States | 0 | - | 4.63 | 106,853 |
| U.S. States by Governor | 0 | - | 4.43 | 18,110 |
| U.S. Political Parties in History | 0 | - | 4.44 | 27,756 |
| U.S. Government Agencies | 0 | - | 4.44 | 19,763 |
| U.S. Presidents by Picture | 0 | - | 4.87 | 428,243 |
| Famous People from Alabama by Picture | 0 | - | 4.07 | 24,126 |
| State Quiz - California | 0 | - | 4.69 | 64,740 |
| Florida Pro Sport Teams | 0 | - | 4.61 | 11,901 |
| Hawaiian Islands | 0 | - | 4.83 | 42,913 |
| Boston Talk to English Translation Quiz | 0 | - | 4.59 | 56,214 |
| Famous People from Michigan by Picture | 0 | - | 4.30 | 21,484 |
| Famous People from New York by Picture | 0 | - | 4.03 | 27,594 |
| Famous People from Texas by Picture | 0 | - | 3.99 | 33,448 |
| U.S. States that Border Tennessee | 0 | - | 4.83 | 65,481 |
| 10 U.S. States With The Highest Murder Rates | 0 | - | 4.47 | 54,765 |
| States and Provinces that touch the Rocky Mountains | 0 | - | 4.43 | 32,556 |
| Name a Valid U.S. State #2 | 0 | - | 4.63 | 77,353 |
| Name a Valid U.S. State #3 | 0 | - | 4.78 | 49,262 |
| U.S. State Superlatives #1 | 0 | - | 4.47 | 87,659 |
| U.S. State Superlatives #2 | 0 | - | 4.53 | 40,744 |
| Top 10 U.S. States With the Most Tornadoes | 0 | - | 4.53 | 64,964 |
| Top 10 Least Religious U.S. States | 0 | - | 4.51 | 34,418 |
| Top 10 U.S. States by Public Transit | 0 | - | 4.74 | 64,001 |
| Top 10 U.S. States with the Most Precipitation | 0 | - | 4.46 | 41,808 |
| Georgia ... or Georgia? | 0 | - | 4.67 | 76,996 |
| U.S. Geography by Letter - C | 0 | - | 4.27 | 74,457 |
| U.S. Geography by Letter - A | 0 | - | 4.37 | 63,488 |
| U.S. Geography by Letter - D | 0 | - | 4.09 | 57,466 |
| U.S. Geography by Letter - T | 0 | - | 4.29 | 50,174 |
| U.S. Geography by Letter - P | 0 | - | 4.38 | 54,364 |
| U.S. Geography by Letter - M | 0 | - | 4.14 | 53,593 |
| U.S. Geography by Letter - L | 0 | - | 4.04 | 41,492 |
| U.S. Geography by Letter - G | 0 | - | 4.13 | 39,650 |
| U.S. Geography by Letter - R | 0 | - | 4.22 | 36,812 |
| U.S. Geography By Letter - H | 0 | - | 4.35 | 40,559 |
| Third Most Common Language by U.S. State | 0 | - | 4.87 | 113,948 |
| American Legal Vocabulary | 0 | - | 4.40 | 34,004 |
| U.S. Cities by Picture #1 | 0 | - | 4.36 | 34,708 |
| Cities by Picture #2 | 0 | - | 4.19 | 35,278 |
| The U.S. Government - How Does it Work? | 0 | - | 4.34 | 42,458 |
| First Names of U.S. Presidents | 0 | - | 4.86 | 383,386 |
| Name a Valid U.S. President #1 | 0 | - | 4.90 | 193,593 |
| History of California | 0 | - | 4.40 | 18,791 |
| ALL California Cities | 0 | - | 4.37 | 43,215 |
| Movies Set in Miami | 0 | - | 4.32 | 16,711 |
| Last 10 U.S. States Alphabetically | 0 | - | 4.35 | 75,037 |
| Top 10 Least Populous U.S. State Capitals | 0 | - | 4.52 | 21,560 |
| Flyover States | 0 | - | 4.53 | 29,584 |
| U.S. States With Double Letters | 0 | - | 4.55 | 24,241 |
| U.S. States Bigger than Their Neighbors | 0 | - | 4.28 | 76,371 |
| U.S. States by Wikipedia Descriptions #1 | 0 | - | 4.57 | 39,447 |
| U.S. States by Wikipedia Descriptions #2 | 0 | - | 4.48 | 37,176 |
| 50 States, 50 Cities - Easy Version | 0 | - | 4.39 | 128,932 |
| Top 10 Richest U.S. States by Median Income | 0 | - | 4.46 | 119,305 |
| Top 10 Least-Forested U.S. States | 0 | - | 4.50 | 46,661 |
| Countries of Europe in 1650 with a Map | 0 | - | 4.95 | 70,220 |
| The Only American Country ... | 0 | - | 4.92 | 122,140 |
| American Countries with the Shortest Names | 0 | - | 4.96 | 121,588 |
| Top 10 Biggest Economies in the Americas | 0 | - | 4.94 | 92,756 |
| All First-Level Subdivisions of South America on a Map | 0 | - | 4.92 | 54,684 |
| Brazil States Map Quiz | 0 | - | 4.86 | 48,512 |
| States of Brazil | 0 | - | 4.97 | 89,483 |
| U.S. State Border Crossings | 0 | - | 4.97 | 96,828 |
| U.S. Citizenship Test Questions | 0 | - | 4.83 | 240,715 |
| Fictional Characters from the Midwest by Picture | 0 | - | 4.04 | 19,229 |
| U.S. Cities with the Most International Tourists | 0 | - | 4.88 | 75,874 |
| U.S. States by Picture #1 | 0 | - | 4.21 | 15,504 |
| Most-Visited U.S. Cities | 0 | - | 4.85 | 94,781 |
| Every U.S. Metro Area on a Map | 0 | - | 4.97 | 82,502 |
| Senators Who Ran For President | 0 | - | 4.24 | 17,077 |
| U.S. Electoral College Landslides | 0 | - | 4.35 | 22,081 |
| California Pro Sport Teams | 0 | - | 4.19 | 22,711 |
| Cities of Los Angeles County on a Map | 0 | - | 4.69 | 27,386 |
| History of Florida | 0 | - | 4.45 | 9,871 |
| Chicago City Trivia | 0 | - | 4.31 | 31,513 |
| Cities and Towns of Massachusetts | 0 | - | 4.93 | 74,905 |
| History of Texas | 0 | - | 4.43 | 14,681 |
| Countries Larger Than Texas but With Fewer People | 0 | - | 4.92 | 40,215 |
| Texas Pro Sport Teams | 0 | - | 4.19 | 16,852 |
| Washington State by Picture | 0 | - | 4.26 | 7,753 |
| Regions of U.S. States | 0 | - | 4.37 | 44,145 |
| States, Provinces & Territories that Touch the Appalachian Mountains | 0 | - | 4.59 | 20,416 |
| 10 U.S. States with the Most Valuable Crops | 0 | - | 4.41 | 29,626 |
| U.S. States with the Lowest HDI | 0 | - | 4.47 | 28,925 |
| Events by U.S. State #1 | 0 | - | 4.43 | 22,959 |
| Which U.S. State - Multiple Choice | 0 | - | 4.48 | 20,356 |
